"Enviro-Safe carb cleaner effectively removes gum, varnish and deposit buildup. The popular ""shear action"" spray system cleans chokes, carbs, linkages, heat risers and PCV valves quickly. Improves performance; fuel burns more efficiently. It is biodgradable, non-corrosive and non-caustic and has low toxicity and no ozone depleting compounds. OEM 9897-97. Sold each."